218 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



and Spotted Flycatcher (Muscicaya grisola) within its 

 bounds. 



ADDENDUM. 



Since the foregoing was written, the following summer 

 migrant falls to be added : — 



14th August, 1908. Yellow Wagtail (Motacilla raii). — 

 This bird is not uncommon in the district, and nests in the 

 vicinity. 



Bryum Duvalii, Voit., in Lanarkshire. 

 By D. A. Boyd. 



[Read 23rd June, 1908.] 



So far as the south-western counties of Scotland are concerned, 

 this moss has as yet been recorded only for Dumfries and Lanark. 

 Its discovery in Lanarkshire was due to Mr. John R. Lee. who 

 obtained specimens on Tinto at the Society's excursion to that 

 mountain on 3rd June, 1905.* 



On 30th May last, when visiting the Lowther range of hills, I 

 was so fortunate as to discover another Lanarkshire station for 

 this species. It grew on the north eastern slope of Durisdeer 

 Hill, in the Parish of Crawford, on boggy ground beside a spring 

 which formed the source of a branch of the Potrail, one of the 

 head-waters of the Clyde. It occurred in numerous patches, 

 which were conspicuous by reason of their bright pink colour. 



In colour and general habit, B. Duvalii bears considerable 

 resemblance to slender and elongated forms of B. pollens, Sw. • 

 from which common moss, however, it may be readily dis- 

 tinguished by its more conspicuously decurrent leaves, shorter 

 nerve, and almost plane leaf-margin, bordered with two rows of 

 narrowly elongated cells. In B. pollens the leaf-margin is dis- 

 tinctly thickened, brownish, and revolute. 



Having thus been found in two localities in Lanarkshire, 

 B. Duvalii may be expected to occur elsewhere throughout the 

 Clyde area, if carefully searched for in the more hilly regions of 

 our district. 



* Tram. Nat. Hist. Soc, Glasgow, Vol. VII., p. 305. 



